hi,
I was one of those early users of babyplus in singapore. I used it around 5 years ago. My son is now 4+ and I did not use it for my daughter (was spoilt).
The comparative results are. My son was born with eyes open and was very alert. He could opint his face features by 6 months. Strong eq and much better concentration span compared to his peers. But I think it is more due to his tv restriction. Good speaker for his age, it is more due to his school and family background. I don't think this is due to bb plus, as he only really start speaking after 2. Teachers have said he is smart, more mature than kids his age but lazy. Academically, he is not more advance than his peers.
I did not use babyplus on my daughter. She was a sleepy baby in the begining. However, she speak much faster than my son. By 15 months, relatively good vocab, and 18 months started to speak 3 words sentences. So good language skill, I feel is more due to to gender thing. Cognitive skills, logical thinking, motor skills better than my son at the same age. However, concentration skills and eq skills not as good as my son at the same age.
I feel though babyplus may give the initial slight advantage, it can be made up with stimulation after birth. How the kid learn etc, is also dependent on the kid's character.
I also feel that babyplus had not much bearing on sleep ability. Becos. sleeping habits will develop after birth.